Characterization and Corrosion Studies of TiAlN PVD Coating by Using the Polarization Test Method

In this research, TiN films were deposited on the SS316L substrate by cathodic arc evaporation technique, to use as bipolar plates in proton exchange membrane fuel cells. The effect of substrate surface roughness and film thickness on the interfacial contact resistance and corrosion properties of the TiN films was investigated. Characterization of deposited films was performed by XRD, XRF, ICR, contact angle, and FESEM equipped with energy-dispersive spectroscopy. Electrochemical and surface properties of deposited films were studied by potentiodynamic scanning, electrochemical impedance spectroscopy, and AFM analysis. It is observed that the surface roughness of the substrate, before deposition, has a significant impact on the final properties of TiN coating, especially when the coating thickness is less than 1.2 µm. All of the coated samples showed better corrosion resistance in comparison to the substrate, and the corrosion current density decreased from 1.65 to 0.16 μA cm -2 when coating thickness increased from 0.6 to 1.5 µm.

Section: Introductionmentioning

confidence: 99%

Investigation of physical and electrical properties of TiN-coated SS316L as bipolar plate of proton exchange membrane fuel cells

Ghorbani

Taherian

Bozorg

2020

“…This load can be corresponded to Lc3 where the coating peeling (or total delamination) begins. 41 It can be added that the scratch test simulates the situation of one body abrasion, and the results can be analyzed as abrasion wear resistance.…”

Section: Resultsmentioning

confidence: 99%

Tribological behaviour of TiAlN and AlCrN coatings on stainless steel

Dalibon,

Maskavizan,

Brühl

2024

TiAlN and AlCrN coatings are widely used in applications that require high stress resistance. In this work, the tribological behaviour of physical vapour deposition (PVD) TiAlN and AlCrN commercial coatings deposited on AISI martensitic stainless steel is studied. Microstructure of the coatings was analysed by X-ray diffraction (XRD), optical microscopy (OM) and scanning electron microscopy (SEM) and nanohardness was measured. Pin-on-disk and abrasive wear tests were performed. Adhesion was evaluated using Rockwell C Indentation and scratch test. The thickness of both coatings was approximately 3 µm. AlCrN lost 30 and 10 times less volume than TiAlN in pin-on-disk tests, under low and high loads, respectively. The steady friction coefficient value was also lower. This indicated that the AlCrN coating had a better performance under sliding conditions. On the other hand, the mass loss was similar for both coatings under abrasive wear, even under severe conditions. In the scratch tests, TiAlN coating failed at 60 N load and AlCrN coating at 70 N, the latter showing a higher value of critical load. The deformation was similar for both coatings as it could be observed in the profiles obtained by a mechanical profilometer at 60 N, however, AlCrN did not show film delamination. This enhanced performance can be attributed to higher fracture toughness and load carrying capacity, which not only improved the mechanical properties of the coating but also its adhesion to the stainless-steel substrate.

“…Wear resistance coatings are used to protect and increase the lifetime of cutting tools, metal forming dies, turbine blades and component surfaces against abrasive wear such as friction and erosion [1][2][3][4][5]. Because of their mechanical properties, excellent tribological and corrosion resistance in harsh environments, transition metal nitrides, carbides and borides, such as TiN, CrN, TiC, TiB 2 , deposited PVD and CVD processes, are widely used as protective coatings [6][7][8][9]. As reported by researchers, CrN compounds are known to be better than TiN in mechanical, tribological, oxidation and corrosion behaviours [8,9].…”

Section: Introductionmentioning

confidence: 99%

“…Because of their mechanical properties, excellent tribological and corrosion resistance in harsh environments, transition metal nitrides, carbides and borides, such as TiN, CrN, TiC, TiB 2 , deposited PVD and CVD processes, are widely used as protective coatings [6][7][8][9]. As reported by researchers, CrN compounds are known to be better than TiN in mechanical, tribological, oxidation and corrosion behaviours [8,9]. The use of ternary metal nitrides and multilayer systems such as CrAlN, TiAlN, Ti/TiN, TiAlSiN, TiAlSiN/CrN, and AlCrN/TiAlSiN has developed on a particularly large scale in the recent years, due to their excellent tribological performance, proper mechanical properties, good stability at high temperature, and suitable high-temperature oxidation and corrosion resistance, in comparison with the aluminium-free coatings such as TiN and CrN [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

The effect of duty cycle on the mechanical and electrochemical corrosion properties of multilayer CrN/CrAlN coatings produced by cathodic arc evaporation

Baseri

Mohammadi

Ghatee

et al. 2020

Multilayer CrN/CrAlN coatings were deposited on the 420-SS by the cathodic arc evaporation system with different duty cycles of bias-voltage. The deposited films were characterized by XRD and FESEM techniques. Mechanical, electrochemical, and surface properties of deposited films were studied by nano-indentation, electrochemical, and AFM analysis. Microstructure investigation confirmed the formation of adhesive and dense nanostructure multilayer film.Increasing the duty cycle led to the decrease in the coating grain size and promoted the hardness to 34.1 ± 4 GPa. A clear reduction of size and distribution of macroparticles was observed by using large repulsive force at a high duty cycle. By increasing the duty cycle, the coating deposition rate was increased from 1.23 to 1.38 µm/h and the surface roughness was decreased from 155 to 70 nm. The lower corrosion current density was obtained for the film applied at the 40% duty cycle (0.59 µA cm −2 ), which was about 10-order of magnitude less than the substrate.